A simple analysis of atmospheric NO{sub}2, SO{sub}2, and O{sub}3 in mountains by passive samplers was investigated and applied to the spatial analysis of air pollutants at Mt. Hiei in Kyoto City. Passive samplers were exposed for 30 days.Yanagisawa-type samplers were used for NO{sub}2 determination. The absorbed NO{sub}2 was measured as nitrite ion spectrophotometrically by the Saltzman method. On the other hand, SO{sub}2 samplers comprising an absorbent filter containing sodium carbonate solution were made. The absorbed SO{sub}2 was oxidized to SO{sub}4{sup}(2-) with an H{sub}2O{sub}2 solution and determined by ion chromatography. For O{sub}3 determination, Ogawa ozone samplers were used. The O{sub}3 reacted with nitrite ion to producenitrate ion, which was measured by ion chromatography. The relative standard deviations for NO{sub}2, SO{sub}2, and O{sub}3 samplers were 1.4, 3-10, and 2-5, respectively. Samplers were set up in 13 locations at Mt. Hiei. The NO{sub}2 concentration and its distribution along the slope of Mt. Hiei changed considerably both daily and seasonally. The seasonal variation of atmospheric NO{sub}2 showed a winter maximum and a summer minimum. The concentration of atmospheric SO{sub}2 at Mt. Hiei was lower thanthat of NO{sub}2 and scarcely changed. Atmospheric O{sub}3 increased gradually with an increase of the altitude, exhibiting a regular pattern with a maximum in spring and a minimum in winter.
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